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Other variables and dynamic variables can be used withing ${ and } to be replaced in the assignment expressions below.
The attribute checkonce[ = "true"|"false"] might be added to assign a dynamic variable only one time at the beginning of the installation process, which makes it behave as a normal variable, although with enhanced capabilities to gather a value.
The attribute ignorefailure[ = "true"|"false"] might be used to allow the installation to continue or abort if an error occurred during gathering the value for a certain dynamic variable.
The assignment of a dynamic variable itself can be made dependent on a certain condition, using the condition attribute, which refers to the ID of condition defined in the installer description elsewhere.
Types of Dynamic Variable Assignments
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<dynamicvariables>
<variable name="previous.version" jarfile="${INSTALL_PATH}/${INSTALL_SUBPATH}/libs/config.jar"
entry="release.properties" type="options"
key="release.version"
checkonce="false" ignorefailure="true" condition="upgradecheck">
<regex regexp="([0-9]+(\.[0-9]+){2})" select="\1" defaultvalue="none"/>
</variable>
<variable name="RegExTest.Select.Windows" checkonce="true"
regkey="HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
regvalue="Path">
<regex regexp="([^;]*)(.*)"
select="\1"
defaultValue="(unmatched)"
casesensitive="false"/>
</variable>
<variable name="RegExTest.ReplaceFirst.Windows" checkonce="true"
regkey="HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
regvalue="Path">
<regex regexp="([^;]*)"
replace="+++ \1 +++"
defaultValue="(unmatched)"
casesensitive="false"
global="false"/>
</variable>
<variable name="RegExTest.ReplaceAll.Windows" checkonce="true"
regkey="HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
regvalue="Path">
<regex regexp="([^;]*)"
replace="+++ \1 +++"
defaultValue="(unmatched)"
casesensitive="false"
global="true"/>
</variable>
</dynamicvariables>
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